An abstract from the University of Iowa study says it all.....

University of Iowa Anesthesia Publications

" Effects of chronic marijuana use on testosterone, luteinizing hormone, follicle stimulating hormone, prolactin and cortisol in men and women.

Block RI, Farinpour R, Schlechte JA
To investigate possible effects of chronic marijuana use on reproductive and stress hormones, we assayed testosterone, luteinizing hormone, follicle stimulating hormone, prolactin, and cortisol in 93 men and 56 women with a mean (+/- S.E.) age of 23.5 +/- 0.4 years. Hormone values were compared among groups of subjects stratified according to frequency of marijuana use (frequent, moderate and infrequent; N = 27, 18, and 30, respectively) and non-using controls (N = 74). Chronic marijuana use showed no significant effect on hormone concentrations in either men or women."

To put is simply, no hormone changes = no man boobs, no impotence, etc. Nor will it make your girl a lesbian or a raging nympho. - Granny:hippy:
Storm Crow Reviewed by Storm Crow on . Attention all male cannabis users! "Smoking pot can cause abnormal increased breast development in males called gynecomastia (sorry, ladies, no such side effect for you)." "This is because chronic use in males has been shown to decrease blood levels of sex hormones, including testosterone, which can lead to decreased sexual pleasure, low sperm counts and decreased sperm mobility and yes, also to the increased development of breasts in males." Soon all of us males are going to have C cup tittys. Rating: 5